CN113582644A - Method for preparing soil stabilizer by compounding bulk industrial solid wastes and application - Google Patents

Method for preparing soil stabilizer by compounding bulk industrial solid wastes and application Download PDF

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CN113582644A
CN113582644A CN202110932581.2A CN202110932581A CN113582644A CN 113582644 A CN113582644 A CN 113582644A CN 202110932581 A CN202110932581 A CN 202110932581A CN 113582644 A CN113582644 A CN 113582644A
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soil
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curing agent
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ash
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王晶晶
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/10—Lime cements or magnesium oxide cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/0409—Waste from the purification of bauxite, e.g. red mud
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/0481—Other specific industrial waste materials not provided for elsewhere in C04B18/00
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
    • C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Abstract

The invention relates to a method for preparing a soil stabilizer by compounding bulk industrial solid wastes and an application thereof, belonging to the technical field of the stabilizer; the method comprises the steps of A component raw material treatment, A component soil curing agent preparation, B component raw material treatment, B component soil curing agent preparation, C component raw material treatment and C component soil curing agent preparation. The method utilizes CaO in the industrial solid waste high-calcium ash to add water to release heat, and adds industrial byproduct gypsum to generate the required compound excitant; adding red mud or carbide slag for dehydration to obtain an alkali activator Ca (OH)2(ii) a CaCO in broken high-calcium ash3The strength of the reinforced concrete is enhanced by the framework. According to different engineering performances, three soil curing agents are prepared and can be used independently or compositely. The whole preparation process needs no calcination, reduces energy consumption and natural resource usage, and reduces production costLow and no three wastes discharge; wide application field, strong pertinence, stable quality, high utilization rate of solid wastes and no secondary pollution after use.

Description

Method for preparing soil stabilizer by compounding bulk industrial solid wastes and application
Technical Field
The invention relates to the technical field of curing agents, in particular to a method for preparing a soil curing agent by compounding bulk industrial solid wastes and application thereof.
Background
The existing stock of industrial solid wastes such as red mud, industrial waste gypsum, coal gangue, fly ash, smelting slag and the like in China exceeds 60 hundred million tons, not only occupies a large amount of land resources, but also causes serious pollution to the environment and influences the sustainable development of the economy in China.
Research has found that most industrial solid wastes have potential active ingredients, and cement, gelled materials and soil solidifying agents are prepared by alkali excitation and metal salt excitation (chemical excitation), and the technology has been in history for decades. Since 1976 the first U.S. patent appeared, the remainder of patent 30 was available in uk, law, europe, etc.; robert studied a highly concentrated liquid soil stabilizer (CIS); thecan studied decomposing basidiomycetes and the like in lignin by saprophytes. The introduction of foreign soil curing agent technology from the eighties, especially the technology of preparing soil curing agent by using industrial solid waste, has achieved many research achievements in China. A representative invention patent is as follows, and an invention patent with a patent number of CN101164952A (method for preparing low-grade roller compacted concrete by utilizing various industrial waste residues) discloses that the low-grade roller compacted concrete with different strengths is prepared by utilizing various industrial waste residues such as red mud, alkaline residue, carbide mud, fly ash, titanium dioxide slag, pyrite slag and the like as raw materials. The method is characterized in that the experimental popularization and application of the road base layer stabilized soil (subbase layer) are carried out on a certain provincial trunk road and an expressway for more than 80 kilometers, and most roads are almost not overhauled after 10-15 years of road operation. 300 technical achievements of invention patent with patent number 202010596995.8, industrial waste residue soil curing agent, invention patent with patent number CN101671986B, road material produced by Bayer process red mud, patent with patent number 200610165797.6, patent with patent number 200510045153.9, experimental research on red mud as road base material, engineering application of red mud high-grade road base material and the like promote the process of producing soil curing agent by using industrial solid waste in road engineering in China.
Therefore, the powdery soil curing agent prepared by using a large amount of industrial solid wastes such as red mud, slag, industrial by-product gypsum, coal gangue, fly ash and the like as raw materials and activating the activity of alkali and metal salt is a known technology, and the preparation of road materials by adding coarse and fine aggregates into the powdery soil curing agent is also a known technology. Similar to industrial by-products such as gypsum, red mud, carbide slag and the like, are listed as key items for national resource utilization, have large inventory of industrial solid wastes, strong hydrophilicity and more impurities, can not be used almost without low-temperature firing or dehydration treatment, and the existing industrial solid wastesThe treatment technology not only produces secondary pollution, but also consumes a large amount of energy, and the low additional value is a main barrier for restricting the comprehensive utilization of the solid wastes; in addition, the land of China is wide, the soil is classified into a plurality of categories, and for different soil qualities, the mixture of lime, lime and fly ash mainly made of air-hardening cementing materials and the mixture of cement, fly ash and other hydraulic cementing materials are still used for modifying and reinforcing the soil to manufacture roadbed soil, stabilized gravel and crushed stone base course. Although the effect is obvious, the production of the general products consumes a plurality of non-renewable resources and emits a large amount of CO2Causing environmental pollution.
In the application of the existing silty soil curing agent, because of the influence of raw materials and an exciting agent, the variety of the prepared curing agent is single, the application range of the curing agent for curing soil or gravel, sand and stone with different properties is limited, the pertinence is poor, the performance requirement is often met by increasing the mixing amount of the curing agent in use, a good effect cannot be achieved under many conditions, the construction cost is increased, and even hidden danger and secondary pollution to the environment can be brought to the engineering quality.
Disclosure of Invention
The invention provides a feasible technical scheme for preparing the soil curing agent by compounding large industrial solid wastes, which is used for preparing wastes by wastes, saves resources, has diversified products and strong pertinence, can ensure the engineering quality and improve the utilization rate of the solid wastes, thereby achieving the purposes of resource recycling, energy conservation and environmental protection.
The invention is implemented according to the following technical scheme:
a method for preparing a soil stabilizer by compounding bulk industrial solid wastes comprises the following steps:
s1, treating the component A by raw materials: leaching the high-calcium ash with water, adding industrial by-product gypsum when the heat release temperature of the high-calcium ash reaches 230 ℃, mixing, turning and stirring, and then standing and curing for 8-48 h to obtain a mixture A; when the water content of the mixture A is less than or equal to 5 percent, the mixture A is sent into a crusher to be crushed, and CaO in the high-calcium ash is promoted to Ca (OH)2The heat release is continued after all the conversion, so that the water content of the mixture A is less than 0.5 percent,obtaining a component A mixture, and sealing for later use;
the above process mainly involves the following reaction equation:
CaO+H2O＝Ca(OH)2+64058J；
Figure BDA0003211595000000031
2CaSO4·2H2O+3CaO＝2CaSO4·0.5H2O+3Ca(OH)2；
s2, preparing the soil curing agent of the component A: feeding the mixture of the component A, slag, fly ash, an activator A and an auxiliary agent A into a ball mill according to the mass ratio of 10-35: 20-60: 5-12: 5-10: 0.5-1 for grinding to obtain a component A soil curing agent; the specific surface area of the A component soil curing agent is more than 580m2Kg, water content less than or equal to 1%;
s3, treating the component B as raw materials: leaching the high-calcium ash with water, adding red mud for stirring and mixing when the heat release temperature of the high-calcium ash reaches 100 ℃, and then standing and curing for 8-24 hours to obtain a mixture B; when the water content of the mixture B is less than or equal to 5 percent, the mixture B is sent into a forced mixer to mix and mix, and CaO in the high-calcium ash slag is promoted to Ca (OH)2Continuously releasing heat after all the conversion, so that the water content of the mixture B is less than 1 percent, obtaining a mixture of the component B, and sealing for later use;
s4, preparing the B component soil curing agent: feeding the mixture of the component B, the fly ash, the exciting agent B and the auxiliary agent B into a ball mill according to the mass ratio of 45-65: 15-30: 1-10: 0.1-0.5 for grinding to obtain a component B soil curing agent; the discharging fineness of the B component soil curing agent is less than or equal to 80 mu m, the screen residue is less than or equal to 15 percent, and the water content is less than or equal to 1 percent;
s5, treating component C raw materials: leaching the high-calcium ash with water, adding carbide slag when the heat release temperature of the high-calcium ash reaches 100 ℃, stirring and mixing, and then standing and curing for 8-24 hours to obtain a mixture C; when the water content of the mixture C is less than or equal to 5 percent, the mixture C is sent into a forced mixer to mix and mix, and CaO in the high-calcium ash slag is promoted to Ca (OH)2All conversions were continuedReleasing heat to ensure that the water content of the mixture C is less than 1 percent to obtain a mixture of the component C, and sealing for later use;
s6, preparing a soil curing agent component C: feeding the mixture of the component C, the fly ash and the activator C into a ball mill according to the mass ratio of 35-55: 25-40: 5-10 for grinding to obtain a component C soil curing agent; the discharging fineness of the C component soil curing agent is less than or equal to 80 mu m, the screen allowance is less than or equal to 15 percent, and the water content is less than or equal to 1 percent.
Preferably, the high-calcium ash is industrial waste generated in the production of alumina; the high-calcium ash comprises 35-55 wt% of CaO and 45-65 wt% of CaCO3The rest is Mg+、Na+、K+The impurities of (1).
Preferably, in the step S1, the mass of the water for leaching the high-calcium ash is 1% of the mass of the high-calcium ash; the mass ratio of the high-calcium ash to the industrial byproduct gypsum is calculated according to the following formula:
Figure BDA0003211595000000041
in the formula: x is the mass of high calcium ash, y1Quality of gypsum as an industrial by-product E1The water content of the industrial by-product gypsum is shown, and Z is the CaO content in the high-calcium ash;
in the step S3, the mass of the water for leaching the high-calcium ash is 1 percent of the mass of the high-calcium ash;
the mass ratio of the high-calcium ash to the red mud is calculated according to the following formula:
ZX＝3.16 E2y2 (2)
in the formula: x is the mass of high calcium ash, y2Is the mass of the red mud, Z is the content of CaO in the high-calcium ash, E2The water content of the red mud;
in the step S5, the mass of the water for leaching the high-calcium ash is 1 percent of the mass of the high-calcium ash;
the mass ratio of the high-calcium ash to the carbide slag is calculated according to the following formula:
ZX＝3.16 E3y3 (3)
in the formula: x is high calcium ashMass of slag, y3Is the weight of the carbide slag, Z is the content of CaO in the high-calcium ash slag, E3The water content of the carbide slag.
Preferably, the water content of the industrial by-product gypsum is less than or equal to 20 percent; the industrial byproduct gypsum is at least one of dihydrate titanium gypsum, dihydrate phosphogypsum and dihydrate desulfurized gypsum;
the industrial by-product gypsum comprises 1.25-4.58 wt% of TiO2、4.80～29.63wt％Fe2O3、0.82～5.86wt％Al2O3、21.60～35.78wt％CaO、0.82～2.98wt％MgO、31.96～37.31wt％SO3、0.95～3.04wt％SiO2。
Preferably, the slag of step S2 is one or two of blast furnace water-quenched slag, steel slag and silicon-manganese-iron;
the slag component comprises 18-55 wt% SiO2、1～35wt％Al2O3、0.01～50wt％CaO、0.01～22wt％MgO、0.01～3wt％Fe2O3、0.01～5wt％MnO。
Preferably, the activator A in the step S2 is at least one of hydrated lime, dehydrated gypsum, Portland cement 52.5, water glass, sodium hydroxide and cement clinker;
the auxiliary agent A is two or more of fly ash, aluminum tripolyphosphate, aluminum potassium sulfate, barium nitrate and borax.
Preferably, the red mud in the step S3 is any one of sintering process red mud, bayer process red mud, and combination process red mud;
the red mud comprises 2.12-7.30 wt% of TiO2、2.83～31.56wt％Fe2O3、19.8～40.63wt％Al2O3、4.88～46.80wt％CaO、1.02～2.05wt％MgO、11.48～45.65wt％SiO2、0.2～3.80wt％K2O、0.20～5.86wt％Na2O。
Preferably, in the steps S2, S4 and S6, the fly ash is the second-level dry ash discharged from the thermal power plant, and the components of the fly ash comprise 0.30-22.40 wt% of Fe2O3、6.09～55.22wt％Al2O3、0.02～29.95wt％CaO、0.02～4.97wt％MgO、19.11～66.72wt％SiO2、0.03～8.44wt％SO3、0.04～3.90wt％K2O、0.02～2.51wt％Na2O, loss on ignition of 0.3 wt%.
Preferably, in step S4, the activator B is at least one of calcium hydroxide, cement clinker, and sodium hydroxide; the auxiliary agent B is any two of triethanolamine, sodium phosphate and sodium lignosulfonate.
Preferably, in the step S5, the carbide slag is obtained by hydrolyzing calcium carbide to obtain acetylene gas, and the components of the carbide slag include 75-85 wt% of Ca (OH)2、0.5～1.1wt％Fe2O3、0.3～0.7wt％Al2O3、0.02～29.95wt％CaO、0.83～1.84wt％Mg(OH)2、6.2～9.1wt％SiO2。
Preferably, in step S6, the activator C is at least one of calcium hydroxide, hemihydrate gypsum, and water glass.
The soil curing agent A is a soil curing agent mainly comprising a hydraulic cementing material and is used for consolidating low liquid limit silty soil, gravel soil, graded gravel and graded broken stones;
the B component soil curing agent is a composite curing agent and is used for consolidating middle liquid limit soil;
the C component soil curing agent is a curing agent mainly prepared from an air-hardening cementing material and is used for consolidating high liquid limit clay soil, micro/medium expansive soil, red clay, silt and acid black clay.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention utilizes the effective CaO in the industrial solid waste high-calcium ash to add water to release heat, treats the industrial byproduct gypsum and generates the required composite excitant (Ca (OH)2With CaSO4·0.5H2O); adding red mud or carbide slag for dehydration to obtain an alkali activator Ca (OH)2(ii) a Residual CaCO in high calcium ash3After being crushed, the material can be used as a framework to increase the strength of a consolidated object. The preparation process of the invention does not need calcination, reduces energy consumption andthe use of natural resources reduces the production cost, and truly realizes the purpose of waste treatment by waste and no three-waste discharge;
2. the soil curing agent prepared by the invention has wide application range: when the consolidated soil is low liquid limit silty soil, gravel soil, graded gravel and graded broken stone, the A component soil curing agent is used; when the soil to be consolidated is medium liquid limit soil, the B component soil curing agent is used (the mixing amount can be reduced); when the soil to be consolidated is high liquid limit clay soil, micro/medium expansive soil, red clay, silt and acid black clay, the C component soil curing agent is used; when meeting various soils of a project or construction environment is bad (such as rainy season, plum rain weather), two or more soil curing agents can be used compositely, the mixing amount of the curing agents does not need to be increased, the construction is convenient and fast, the pertinence is strong, and the construction cost is reduced;
3. the invention has high utilization rate of solid waste and no secondary pollution after use.
Drawings
FIG. 1 is a process flow diagram of the component A soil stabilizer of the present invention;
FIG. 2 is a process flow diagram of the component B soil stabilizer of the present invention;
FIG. 3 is a process flow diagram of the component C soil stabilizer of the present invention.
Detailed Description
In order to make those skilled in the art more clearly understand the technical solution of the present invention, the preparation process, the construction process and the application effect of the present invention are completely described with particular reference to the specific embodiments in the last two decades. The described embodiments are merely representative of some, and not all, embodiments of the present invention. Various modifications and alterations of this invention will occur to those skilled in the art without departing from the scope of this invention.
Example 1
As shown in fig. 2, a method for preparing a soil stabilizer by compounding bulk industrial solid wastes comprises the following steps: (1) b, component raw material treatment:
the raw material detection shows that the CaO content of the high-calcium ash is 50%, the water content of the red mud is 28%, and the water content of the fly ash is less than 1%, and according to technical parameters and a material plan provided by a user, 5200t of the B-component soil curing agent is prepared.
The amounts of all materials were calculated according to the following formula:
ZX＝3.16E2y2(ii) a Wherein X is the mass of high calcium ash and y2Is the mass of the red mud, Z is the content of CaO in the high-calcium ash, E2The water content of the red mud;
the mixture of the component B, the fly ash, the excitant B and the auxiliary agent B are 62.16: 29.44: 8: 0.4;
20.62t of water, 2062t of high-calcium ash and 1171t of red mud, and the raw materials are prepared into 130 equal parts. Leaching 15.862t of high-calcium ash with 0.15862t of water in each part, adding 39.033t of red mud when the heat release temperature of the high-calcium ash reaches 100 ℃, mixing, stirring, and standing and curing for 24 hours; for promoting CaO to Ca (OH)2After all the components are converted and released heat, continuously mixing and stirring until the water content is reduced to 1 percent to prepare a part of mixture of the component B, and sealing for later use;
(2) b, preparing a component soil curing agent: calculating the dosage of each material according to the mixing proportion in the step (1) to obtain a B component mixture (Ca (OH) in the B component mixture)2The mass of the red mud accounts for 20 percent of the mass of the mixture, the mass of the red mud accounts for 22.5 percent of the mass of the mixture, and the balance is CaCO3) Fly ash, exciting agent B (cement clinker) and assistant (sodium phosphate and sodium lignosulfonate in the mass ratio of sodium phosphate: the sodium lignosulfonate is 1:3, 3232.32t, 1530.88t, 416t, 20.8t, 130 equal parts of the above materials are evenly divided and fed into a ball mill for grinding to obtain 5200t of the B component soil curing agent, the discharge fineness of the B component soil curing agent is less than or equal to 80 μm, the screen residue is less than or equal to 15%, and the water content is less than or equal to 1%.
Application example:
application example of subbase stabilized soil in 2008 for the usual road-paying period (total length 13.5Km) on the first-level roads in Henan province: the plasticity index of the soil detected on site is 12, the optimal water content is 16.00 percent, and the maximum dry density is 1.76g/cm3Through design optimization, the doping amount of the B component soil curing agent is determined to be 6% of the weight of the dry soil. Refer to the technical Specification for constructing road surface base course of road engineering JTJ 034-2000 item 5.1 and 5.4The quality control and inspection method organizes construction, and refers to the road engineering quality inspection and assessment Standard JTG F80/1-2004 Table 7.8.2 for quality assessment.
Through detection, the 7d unconfined compressive strength is 0.83Mpa, the 28d unconfined compressive strength is more than 5.5Mpa, the deflection value is less than the design value, and all indexes meet the design requirements. And the road section is qualified after completion and acceptance in 2011. The price of the cement is 160 yuan/ton, the price of the lime is 110 yuan/ton, the price of the B component soil curing agent is 75 yuan/ton, and the material cost is saved by about 40 percent. The road section is still in operation, and the durability and the economic benefit of the road subbase stabilized soil prepared by the B-component soil curing agent in the embodiment are proved to be superior to those of cement stabilized soil, lime and fly ash stabilized soil, and no secondary pollution is caused.
Example 2
As shown in fig. 1, a method for preparing a soil stabilizer by compounding bulk industrial solid wastes comprises the following steps: (1) treating the raw materials of the component A:
according to raw material detection, the CaO content of the high-calcium ash is 52%, the water content of the titanium gypsum is 23%, and 70t of the A-component soil curing agent is prepared according to technical parameters and a material plan provided by a user.
The amounts of all materials were calculated according to the following formula:
Figure BDA0003211595000000091
wherein X is the mass of high calcium ash and y1Is the mass of titanium gypsum, E1The water content of the titanium gypsum is shown, and Z is the CaO content in the high-calcium ash;
the component A comprises the mixture of the components A, slag, fly ash, an excitant A and an auxiliary agent A, wherein the ratio of the mixture to the fly ash to the excitant A to the auxiliary agent A is 30: 48: 11.5: 10: 0.5;
0.0884t of water, 8.84t of high-calcium ash and 12.14t of titanium gypsum; firstly, adding water into high-calcium ash for leaching, adding titanium gypsum for stirring and mixing when the heat release temperature of the high-calcium ash reaches 230 ℃, and then standing and curing for 24 hours; when the water content is detected to be 2.5 percent, the mixture is sent into a forced mixer to mix and mix, and CaO is promoted to Ca (OH)2All transformation is followedContinuously releasing heat, finally measuring that the water content of the mixture is 0.4 percent, preparing the mixture of the component A, and sealing for later use;
(2) the preparation of the component A, namely the soil curing agent: calculating the dosage of each material according to the mixing proportion in the step (1) to obtain the mixture of the component A (Ca (OH) in the mixture of the component A)2The mass of the gypsum dihydrate accounts for 6.5 percent of the mass of the mixture, the mass of the gypsum dihydrate accounts for 17.3 percent of the mass of the mixture, and the balance is CaCO3) Slag (blast furnace water-quenched slag), fly ash, an activator A (cement clinker) and an auxiliary A (aluminum potassium sulfate and barium nitrate are selected, and the mass ratio of the aluminum potassium sulfate to the barium nitrate is as follows: 2 parts of barium nitrate is 2:3, 21 t: 33.6 t: 8.05 t: 7 t: 3.5t, and the materials are respectively put into a ball mill in equal parts by weight for grinding to prepare 70t of the A component soil curing agent; the specific surface area of the A component soil curing agent is more than 580m2Kg, water content less than or equal to 1 percent.
Application example:
in 2021, in Henan province, along the Taiwang high-speed Xinxiang section (mile pile numbers K25+ 500-K25 +900), the application example of the subbase layer stabilizing gravel soil is as follows: the plasticity index of the soil detected on site is 5.8, the optimal water content is 7.55 percent, and the maximum dry density is 2.22g/cm3Through design optimization, the doping amount of the soil curing agent of the component A is determined to be 3% of the weight of the gravel soil, and construction of curing agent stabilizing gravel is carried out on the roadbed. The construction is organized according to the process quality control and inspection method of 'detailed road pavement foundation construction technology' JTG/T F20-2015 and 'soil solidifying agent application technical Standard' CJJ/T286-2018, and the quality is evaluated according to 'road engineering quality inspection evaluation Standard' JTG F80/1-2004 Table 7.8.2.
The detection proves that the 7d unconfined compressive strength is 4.51 Mpa; according to environmental detection and evaluation, the 8-factor heavy metal extract meets the requirements of 'hazardous waste identification standard leaching toxicity identification' GB5085.3-2007 and 'urban sewage recycling green land irrigation water quality' GB/T25499, and has no secondary pollution. The component A soil stabilizer solidified gravel soil of the embodiment is proved to be superior to cement stabilizing gravel, lime and fly ash stabilizing gravel.
The embodiment is characterized in that: utilizes the potential heat energy of CaO in the high-calcium ash slag, and the heat energy is excited by firstly spraying water in a reaction device to be dischargedAnd heat is gathered in the reaction device (without heat exchange with the outside) to rapidly increase the temperature to 170-230 ℃, and the titanium gypsum and the H-containing gypsum are obtained2SO4The industrial solid waste with strong hydrophilicity provides the conditions of physical and chemical reaction, at this time, titanium gypsum (industrial by-product gypsum) is added, and heat exchange and reaction are carried out by standing, settling, crushing and intermittent movement to prepare Ca (OH) used for soil solidifying agent2And CaSO4·0.5H2O composite activator and powdered CaCO3(ii) a Then adding blast furnace water-quenched slag, fly ash, cement clinker serving as a composite activator and auxiliary agents of aluminum potassium sulfate and barium nitrate for retarding to prepare a component A soil curing agent mainly comprising a hydraulic cementing material; the method is used for consolidating the low liquid limit soil. The preparation process is simple, easy to operate, low in cost and high in practicability. The aims of treating waste by waste, changing waste into valuable, saving energy and having no three-waste discharge are really realized.
Example 3
As shown in fig. 3, a method for preparing a soil stabilizer by compounding bulk industrial solid wastes comprises the following steps: (1) c, component raw material treatment:
the raw material detection shows that the CaO content of the high-calcium ash is 48 percent, the water content of the carbide slag is 28 percent, and 350t of the C-component soil curing agent is prepared according to technical parameters and material plan provided by a user.
The amounts of all materials were calculated according to the following formula:
ZX＝3.16E3y3(ii) a In the formula: x is the mass of high calcium ash, y3Is the weight of the carbide slag, Z is the content of CaO in the high-calcium ash slag, E3The water content of the carbide slag;
the mixture of the component C, the fly ash and the excitant C are 52: 40: 8;
1.177t of water, 117.7t of high-calcium ash and 64.3t of carbide slag, and preparing the raw materials in 10 equal parts; leaching 11.77t of high-calcium ash with 0.1177t of water in each part, adding 6.43t of carbide slag when the heat release temperature of the high-calcium ash reaches 100 ℃, stirring and mixing, and then standing and curing for 24 hours; for promoting CaO to Ca (OH)2The heat release is continued after all the conversion, each equal part of the mixture is continuously stirred,until the water content is less than 1%, preparing a mixture of the component C, and sealing for later use;
(2) c, preparing a component soil curing agent: calculating the dosage of each material according to the mixing proportion in the step (1) to obtain a mixture of the component C (Ca (OH) in the mixture of the component C)2The mass of the carbide slag is 16 percent of the mass of the mixture, the mass of the carbide slag is 18.3 percent of the mass of the mixture, and the balance is CaCO3) The raw materials are respectively divided into 10 equal parts and sent into a ball mill for grinding to prepare 350t of C-component soil curing agent, the discharge fineness of the C-component soil curing agent is less than or equal to 80 mu m, the screen residue is less than or equal to 15 percent, and the water content is less than or equal to 1 percent.
Application example:
an application example of roadbed modified soil from Anluo high-speed Shancai to Roshan section in Henan province in 9 months in 2020, wherein roadbed fillers suitable for a construction road section are mostly river channel sludge, belong to high liquid limit micro-expansion powdery clay and belong to special clay for water absorption expansion softening and soil drying shrinkage cracking; the plasticity index of the plain soil is 22 and the natural water content is more than 36 percent. By utilizing the characteristic that the consolidation speed of the C-component soil curing agent air-hardening cementing material is low (generally within 48 hours), the C-component soil curing agent with the weight of 4% of the weight of the C-component soil curing agent is added into the sludge for 10 hours of sedimentation (the water content can be reduced by 8-10 percentage points through repeated tests), and when the consolidated soil is close to the optimal water content (2-3%), the B-component soil curing agent with the weight of 3% of the total weight of the B-component soil curing agent is added for the second time (embodiment 1 of the invention), and the curing treatment is carried out twice. The soil curing agent C and the soil curing agent B are mixed for use to carry out compound blending and molding on the cured soil. The construction is organized according to the process quality control and inspection method required by the technical Specification for road foundation construction in Highway engineering JTJ 034-2000 item 5.1 and 5.4.
The detection shows that the CBR value is 24.8 when the compactness is 93 percent, the 7d unconfined compressive strength is 0.66Mpa, each index meets the design requirement, no crack exists, and the price is superior to that of cement and lime.
In the embodiment, the component C is a soil curing agent mainly comprising an air-hardening cementing material, and the sludge is quickly absorbed by using the strong hydrophilic property of unreacted CaO in high-calcium ash, NaOH in an activator and fly ashMiddle water content, powdery CaCO in high-calcium ash3The silt can be sanded and the plasticity of the silt is improved, and the silt can also serve as a framework in soil to improve the strength of the silt. The C-component soil curing agent and the B-component soil curing agent are mixed for use, so that the cured soil is ensured to have better strength and water stability, and the crack resistance can be obviously improved; the method also overcomes the defect that a large amount of personnel and equipment are idle due to frequent 'eating by the sky' in the high liquid limit clay construction, avoids repeated reworking, material waste and cost increase caused by common 'common quality problems' such as 'springs', 'mushrooms', cracking and the like after the roadbed is formed, and is deeply praised by users.
Example 4
A method for preparing a soil stabilizer by compounding bulk industrial solid wastes comprises the following steps: the preparation method is the same as that of the A component soil stabilizer in the example 2.
And (3) detecting the strength and stability of the component A soil curing agent according to GB175-2007, wherein the 3d compressive strength is 16.5Mpa, the 28d compressive strength is 38.7Mpa, the 3d flexural strength is 3.8Mpa, the 28d flexural strength is 7.9Mpa, and the stability is qualified. The detection is carried out according to 'hazardous waste identification standard leaching toxicity identification' GB5085.3-2007 and 'urban sewage recycling green land irrigation water quality' GB/T25499, and the requirements of national standards are met.
Example 5
A method for preparing a soil stabilizer by compounding bulk industrial solid wastes comprises the following steps: the preparation method is the same as that of the B component soil stabilizer in the example 1.
The B component soil curing agent is used for curing the medium liquid limit clay, the plasticity index of the soil is 10, the optimal water content is 12.5 percent, and the maximum dry density is 1.71kg/cm3The mixing amount of the curing agent is 4 percent of the weight of the dry soil,
the unconfined compressive strength of 7d (6d for health preservation and 1d for water soaking) is 2.8Mpa, the unconfined compressive strength of 28d is 7.1Mpa, and the volume expansion rate of 90d is-69 multiplied by 10﹣6. The detection is carried out according to 'hazardous waste identification standard leaching toxicity identification' GB5085.3-2007 and 'urban sewage recycling green land irrigation water quality' GB/T25499, and the requirements of national standards are met.

Claims (12)

1. A method for preparing a soil stabilizer by compounding bulk industrial solid wastes is characterized by comprising the following steps: the method comprises the following steps:
s1, treating the component A by raw materials: leaching the high-calcium ash with water, adding industrial by-product gypsum when the heat release temperature of the high-calcium ash reaches 230 ℃, mixing, turning and stirring, and then standing and curing for 8-48 h to obtain a mixture A; when the water content of the mixture A is less than or equal to 5 percent, the mixture A is sent into a crusher to be crushed, and CaO in the high-calcium ash is promoted to Ca (OH)2Continuously releasing heat after all the conversion, so that the water content of the mixture A is less than 0.5 percent, obtaining a component A mixture, and sealing for later use;
s2, preparing the soil curing agent of the component A: feeding the mixture of the component A, slag, fly ash, an activator A and an auxiliary agent A into a ball mill according to the mass ratio of 10-35: 20-60: 5-12: 5-10: 0.5-1 for grinding to obtain a component A soil curing agent; the specific surface area of the A component soil curing agent is more than 580m2Kg, water content less than or equal to 1%;
s3, treating the component B as raw materials: leaching the high-calcium ash with water, adding red mud for stirring and mixing when the heat release temperature of the high-calcium ash reaches 100 ℃, and then standing and curing for 8-24 hours to obtain a mixture B; when the water content of the mixture B is less than or equal to 5 percent, the mixture B is sent into a forced mixer to mix and mix, and CaO in the high-calcium ash slag is promoted to Ca (OH)2Continuously releasing heat after all the conversion, so that the water content of the mixture B is less than 1 percent, obtaining a mixture of the component B, and sealing for later use;
s4, preparing the B component soil curing agent: feeding the mixture of the component B, the fly ash, the exciting agent B and the auxiliary agent B into a ball mill according to the mass ratio of 45-65: 15-30: 1-10: 0.1-0.5 for grinding to obtain a component B soil curing agent; the discharging fineness of the B component soil curing agent is less than or equal to 80 mu m, the screen residue is less than or equal to 15 percent, and the water content is less than or equal to 1 percent;
s5, treating component C raw materials: leaching the high-calcium ash with water, adding carbide slag when the heat release temperature of the high-calcium ash reaches 100 ℃, stirring and mixing, and then standing and curing for 8-24 hours to obtain a mixture C; when the water content of the mixture C is less than or equal to 5 percent, the mixture C is sent into a forced mixer to be mixedMixing the materials to promote CaO in the high-calcium ash to Ca (OH)2The heat release is continued after all the conversion, so that the water content of the mixture C is less than 1 percent, and the mixture of the component C is obtained and sealed for later use;
s6, preparing a soil curing agent component C: feeding the mixture of the component C, the fly ash and the activator C into a ball mill according to the mass ratio of 35-55: 25-40: 5-10 for grinding to obtain a component C soil curing agent; the discharging fineness of the C component soil curing agent is less than or equal to 80 mu m, the screen allowance is less than or equal to 15 percent, and the water content is less than or equal to 1 percent.
2. The method for preparing the soil stabilizer by compounding the bulk industrial solid waste according to claim 1, wherein the method comprises the following steps: the high-calcium ash is industrial waste generated in the production of alumina; the high-calcium ash comprises 35-55 wt% of CaO and 45-65 wt% of CaCO3The rest is Mg+、Na+、K+The impurities of (1).
3. The method for preparing the soil stabilizer by compounding the bulk industrial solid waste according to claim 1, wherein the method comprises the following steps: in the step S1, the mass of the water for leaching the high-calcium ash is 1 percent of the mass of the high-calcium ash;
the mass ratio of the high-calcium ash to the industrial byproduct gypsum is calculated according to the following formula:
Figure FDA0003211594990000021
in the formula: x is the mass of high calcium ash, y1Quality of gypsum as an industrial by-product E1The water content of the industrial by-product gypsum is shown, and Z is the CaO content in the high-calcium ash;
in the step S3, the mass of the water for leaching the high-calcium ash is 1 percent of the mass of the high-calcium ash;
the mass ratio of the high-calcium ash to the red mud is calculated according to the following formula:
ZX＝3.16E2y2 (2)
in the formula: x is the mass of high calcium ash, y2Is the mass of red mud, and Z is highCaO content in lime-ash, E2The water content of the red mud;
in the step S5, the mass of the water for leaching the high-calcium ash is 1 percent of the mass of the high-calcium ash;
the mass ratio of the high-calcium ash to the carbide slag is calculated according to the following formula:
ZX＝3.16E3y3 (3)
in the formula: x is the mass of high calcium ash, y3Is the weight of the carbide slag, Z is the content of CaO in the high-calcium ash slag, E3The water content of the carbide slag.
4. The method for preparing the soil stabilizer by compounding the bulk industrial solid waste, according to claim 3, is characterized in that: the water content of the industrial by-product gypsum is less than or equal to 20 percent; the industrial byproduct gypsum is at least one of dihydrate titanium gypsum, dihydrate phosphogypsum and dihydrate desulfurized gypsum;
the industrial by-product gypsum comprises 1.25-4.58 wt% of TiO2、4.80～29.63wt％Fe2O3、0.82～5.86wt％Al2O3、21.60～35.78wt％CaO、0.82～2.98wt％MgO、31.96～37.31wt％SO3、0.95～3.04wt％SiO2。
5. The method for preparing the soil stabilizer by compounding the bulk industrial solid waste according to claim 1, wherein the method comprises the following steps: the slag of the step S2 is one or two of blast furnace water quenching slag, steel slag and ferro-silico-manganese;
the slag component comprises 18-55 wt% SiO2、1～35wt％Al2O3、0.01～50wt％CaO、0.01～22wt％MgO、0.01～3wt％Fe2O3、0.01～5wt％MnO。
6. The method for preparing the soil stabilizer by compounding the bulk industrial solid waste according to claim 1, wherein the method comprises the following steps: the exciting agent A in the step S2 is at least one of hydrated lime, dehydrated gypsum, Portland cement 52.5, water glass, sodium hydroxide and cement clinker;
the auxiliary agent A is two or more of fly ash, aluminum tripolyphosphate, aluminum potassium sulfate, barium nitrate and borax.
7. The method for preparing the soil stabilizer by compounding the bulk industrial solid waste, according to claim 3, is characterized in that: the red mud in the step S3 is any one of sintering process red mud, Bayer process red mud and combination process red mud;
the red mud comprises 2.12-7.30 wt% of TiO2、2.83～31.56wt％Fe2O3、19.8～40.63wt％Al2O3、4.88～46.80wt％CaO、1.02～2.05wt％MgO、11.48～45.65wt％SiO2、0.2～3.80wt％K2O、0.20～5.86wt％Na2O。
8. The method for preparing the soil stabilizer by compounding the bulk industrial solid waste according to claim 1, wherein the method comprises the following steps:
in the steps S2, S4 and S6, the fly ash is the second-level dry ash discharged from the thermal power plant and comprises 0.30-22.40 wt% of Fe2O3、6.09～55.22wt％Al2O3、0.02～29.95wt％CaO、0.02～4.97wt％MgO、19.11～66.72wt％SiO2、0.03～8.44wt％SO3、0.04～3.90wt％K2O、0.02～2.51wt％Na2O, loss on ignition of 0.3 wt%.
9. The method for preparing the soil stabilizer by compounding the bulk industrial solid waste according to claim 1, wherein the method comprises the following steps: in the step S4, the activator B is at least one of calcium hydroxide, cement clinker, and sodium hydroxide; the auxiliary agent B is any two of triethanolamine, sodium phosphate and sodium lignosulfonate.
10. The method for preparing the soil stabilizer by compounding the bulk industrial solid waste, according to claim 3, is characterized in that:
in the step S5, the carbide slag is obtained by hydrolyzing calcium carbideThe waste residue after acetylene gas comprises 75-85 wt% of Ca (OH)2、0.5～1.1wt％Fe2O3、0.3～0.7wt％Al2O3、0.02～29.95wt％CaO、0.83～1.84wt％Mg(OH)2、6.2～9.1wt％SiO2。
11. The method for preparing the soil stabilizer by compounding the bulk industrial solid waste according to claim 1, wherein the method comprises the following steps: in the step S6, the activator C is at least one of calcium hydroxide, hemihydrate gypsum, and water glass.
12. Use of a soil stabilizer prepared by the method of any one of claims 1 to 11, wherein: the component A is a soil curing agent which takes hydraulic cementing materials as main materials and is used for consolidating low liquid limit silty soil, gravel soil, graded gravel and graded broken stones;
the B component soil curing agent is a composite curing agent and is used for consolidating middle liquid limit soil;
the C component soil curing agent is a curing agent mainly prepared from an air-hardening cementing material and is used for consolidating high liquid limit clay soil, micro/medium expansive soil, red clay, silt and acid black clay.
CN202110932581.2A 2021-08-13 2021-08-13 Method for preparing soil stabilizer by compounding bulk industrial solid wastes and application Withdrawn CN113582644A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114684839A (en) * 2022-03-07 2022-07-01 南京工程学院 Method for grading, mineralizing and carbon-fixing industrial by-product gypsum and gradient utilization of products
CN115417652A (en) * 2022-07-19 2022-12-02 山东大学 Yellow flooding area silt solid waste base soil curing agent and application thereof
CN115724622A (en) * 2022-12-27 2023-03-03 河南锐实达分离设备科技股份有限公司 Soil pressure shield argillaceous muck composite curing agent and curing method thereof
CN115974517A (en) * 2022-12-26 2023-04-18 葛洲坝中固科技股份有限公司 High liquid limit soil curing agent and preparation method thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114684839A (en) * 2022-03-07 2022-07-01 南京工程学院 Method for grading, mineralizing and carbon-fixing industrial by-product gypsum and gradient utilization of products
CN114684839B (en) * 2022-03-07 2024-03-22 南京工程学院 Hierarchical mineralization carbon fixation and product cascade utilization method for industrial byproduct gypsum
CN115417652A (en) * 2022-07-19 2022-12-02 山东大学 Yellow flooding area silt solid waste base soil curing agent and application thereof
CN115974517A (en) * 2022-12-26 2023-04-18 葛洲坝中固科技股份有限公司 High liquid limit soil curing agent and preparation method thereof
CN115724622A (en) * 2022-12-27 2023-03-03 河南锐实达分离设备科技股份有限公司 Soil pressure shield argillaceous muck composite curing agent and curing method thereof

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